Stencils for duplicating machines



April 3o, 1957 A. J. PARsLow s'rENcILs Foa DUPLICATING MACHINES FiledSept. 15, 1953 l Ivre v'ra STENCILS FOR DUPLICATING MACHINES ArchibaldJoseph Parslow, Grange Park, England, as-

signor to Gestetner Limited, London, England, a British companyApplication September 15, 1953, Serial No. 380,267

Claims priority, application Great Britain September 18, 1952 2 Claims.(Cl. lill-128.2)

This invention relates to stencils for duplicating machines.

Stencils for duplicating machines are normally provided with a backingsheet which protects the stencil sheet before use and when cutting andwhich is removed when the stencil is put on the duplicating machine.

The object `of this invention is to permit duplication of theinformation on the stencil in stages.

Another object is to enable 'a single stencil to reproduce two sets ofcopies of which both sets have certain infomation -in common and one sethas information additional to the vother set.

A further object is to enable a single stencil bearing certaininfomation to be used for reproducing two sets of copies bearingdifferent information.

Yet a further object of this invention -is the provision of a stencilhearing information in columns which permits certain of the co-lumnsonly to be reproduced on one set of copies and all of the columns to besubsequently reproduced on another set of copies.

A practical application of the present invention will now be described,by way of example only, with reference to the accompanying drawings ofwhich:

Figure 1 is a plan view of a stencil in accordance with the presentinvention looking on to the stencil sheet,

Figure 2 diagrammatically illustrates how the stencil 'of Figure l isused, and

Figures 3 is a view corresponding to Figure 1 showing an alternativeconstruction of stencil in accordance with the present invention.

Referring to Figure l: the stencil comprises a stencil sheet 5 rand abacking sheet 6. The stencil sheet 5 is secured to the head 7 of thebacking sheet in any wellknown and convenient manner and the head 7 isadapted for attachment to the duplicating machine, for instance, it hasholes 8 to engage pins on the machine.

The stencil sheet 5 is divided by a vertical, perforated line 9 (i. e.parallel with the long edge of the sheet) into two portions, which aregenerally indicated at 10 and 11. The portion 10 carries headings, as at12, and is divided into columns, as at 13. Similarly, the portion 11carries headings, as at 14, and is Idivided into columns, as at 15.

The backing sheet, las is customary, is horizontally divided from head 7by a perforated line 16 so that the backing sheet may be removed fromthe head. Additionally, the backing sheet is divided into portions 17,18 by a perforated vertical l-ine 19 and it will be noted in Figure 2that the perforations 9 and 19 are slightly offset across the width Iofthe stencil for a purpose which will later be described. The portions 17fand 18 yof the backing sheet correspond with the portions 10 and 11respectively of the stencil sheet. ai

In use: the stencil is mounted on the duplicatingiachine (which isgenerally indicated in Figure 2 by the reference numeral 20) andthereafter the portion 17 of the backing sheet is removed by tearingalong the perforations 16 and 19, for instance by holding the portion 17as shown in Figure 2 and rotating the handle 21 of the Patented Apr. 30,1957 ICC duplicating machine in the direction of the arrow a. Copies arethen printed bearing only the informaion on the portion 10 of thestencil sheet 5, the portion 11 of the stenc-il sheet being covered bythe portion 18 of the backing sheet so that this information is notreproduced. After a sutlicient number of copies has been run ofi, theportion 18 of the backing sheet is removed and the required number ofcopies bearing the linformation on the entire stencil sheet is then runoff. When -using the copies so obtained, the copies with the informationof the portion 10 only are sent externally :of the organisation forwhich the copies lare prepared, whereas the copies bearing thisinfomation and the additional information `of lthe portion 1 1 areretained for use internally of the organisation.

Figure 3 illustrates a modified construction of stencil wherein thebacking sheet is divided by a plurality of vertical lines ofperforations 22 int-o a number of separiately removable portions. Itwill be evident that the backing sheet may be provided with bothhorizontal and Vertical lines of perforations, if so desired, i. e. thelines of perforations are parallel with both adjacent edges of rthesheet.

The perforated line 9 will separate the information of portion 10 fromthat of portion 11 in t-he copies containing all the information of thestencil and also defines the extent of the last column of portion 10 inthe copies containing only the information of the latter portion. Byloffsetting perforations 9 and 19 as shown in Figure 2 -it is ensuredthat the perforated line 9 is reproduced on both sets of copies.Additionally, when producing the copies with restricted information inkpenetrating line 9 does not pass on tothe edge of portion 18 and smudgethe cop-ies.

l claiin:

l. A stencil for use in a duplicating machine comprising a heading bywhich the stencil is attached to the machine, a stencil sheetpermanently secured to the heading and a backing sheet removably securedto the heading, the backing sheet being o-f substantially the samedimensions as the stencil sheet and being sub-divided into at least tworemovable parts by a line of perforations eX- tending between theheading and the backing sheet and at least another line of perforationsexten-ding fully across from one short edge of the backing sheet toanother short edge and parallel to a long edge of the backing sheet.

2. A stencil for use in a duplicating machine comprising a heading bywhich the stencil is attached to the machine, a stencil sheetpermanently secured to the heading and a backing sheet removably securedto the heading, the backing sheet being sub-divided into at least tworemovable parts by a line of perforations extending between the headingand the backing sheet and at least another line of perforationsextending fully across from one short edge -of the backing sheet toanother short edge and parallel to a l'ong edge of the backing sheet,and a line of perforations on said stencil sheet parallel to said otherline of perforations on the backing sheet but odset therefrom.

References Cited in the tile of this patent UNITED STATES PATENTS1,532,834 Rand Apr. 7, 1925 2,176,187 Perry Oct. 17, 1939 2,176,771Nachman Oct. 17, 1939 2,220,244 Jagger Nov. 5, 1940 2,220,265 MorrisonNov. 5, 1940 FOREIGN PATENTS 59,182 Switzerland Dec. 17, 1912 340,935Italy June 2, 1936 748,367 France Apr. 10, 1933 830,499 France May 19,1938

